Where to find PUP or Castrol Edge Extended??

[Gokhan]

Originally Posted By: Fasttimez
Originally Posted By: Gokhan
In this modern day, there is really no point in using a synthetic 10W-30 instead of a synthetic 5W-30. You sacrifice a lot in viscosimetric properties without seeing any benefit in oil-film thickness or strength. Lower NOACK won't help much with your oil consumption as synthetic 5W-30 already has a low NOACK.

PUP 5w30 NOACK is 11.5 vs PUP 10w30 NOACK is 5.7, I wouldn't consider 11.5 a low NOACK for a 5w30 at all.

I would say 10% is very low. For M1 it's 10.1% and for M1 EP it should be even less (8 - 9%). I would still go with a synthetic 5W-30 instead of a 10W-30. See these PQIA results for NOACK of various synthetic oils:

http://www.pqiamerica.com/March2013PCMO/Marchsyntheticsallfinal.html

Here is the result for the new PP (with PurePlus), which is a good 9.1%:

http://www.pqiamerica.com/June 2014/pennzplatinum.htm

 

[Garak]

Originally Posted By: Gokhan
Yup, Shell said in the Jobbers World article six years ago that is linked above that the standard deviation, which is the standard error of the sequence IVA measurement, is 12.5 µm.

That is precisely why I always hammer on about error measurements here. I try to give labs and the like the benefit of the doubt, but I have difficulty accepting concentrations to four significant figures, and clearly here, we're seeing error bars exceeding the magnitude of the measurement in the first place. It's the same when we talk about fuel economy. Our pumps up here measure to the nearest millilitre. As if....

 

[Gokhan]

Originally Posted By: Gokhan
Originally Posted By: Fasttimez
Originally Posted By: Gokhan
In this modern day, there is really no point in using a synthetic 10W-30 instead of a synthetic 5W-30. You sacrifice a lot in viscosimetric properties without seeing any benefit in oil-film thickness or strength. Lower NOACK won't help much with your oil consumption as synthetic 5W-30 already has a low NOACK.

PUP 5w30 NOACK is 11.5 vs PUP 10w30 NOACK is 5.7, I wouldn't consider 11.5 a low NOACK for a 5w30 at all.

I would say 10% is very low. For M1 it's 10.1% and for M1 EP it should be even less (8 - 9%). I would still go with a synthetic 5W-30 instead of a 10W-30. See these PQIA results for NOACK of various synthetic oils:

http://www.pqiamerica.com/March2013PCMO/Marchsyntheticsallfinal.html

Here is the result for the new PP (with PurePlus), which is a good 9.1%:

http://www.pqiamerica.com/June 2014/pennzplatinum.htm

Again, don't fall into the fallacy of comparing NOACK values for different cold-start viscosities or judging the base-oil quality using NOACK for different cold-start viscosities. If the cold-start viscosities are the same, you can use NOACK to judge the base-oil quality. Comparing 5W-30 and 10W-30 NOACKs do no good. See the following figures. Even with Group II, you can have a very low NOACK if you have a high cold-start viscosity:

We use NOACK here to judge the base-oil quality for similar cold-start viscosities. Other than that, the only advantage of lower NOACK is less oil consumption through evaporation. If you aren't having much evaporative oil consumption, less NOACK won't really help you much.

It's needless to say but if you are living in the Northeast, running 10W-30 in the winter is not good for your engine.